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Hydrogrossular, is a calcium aluminium garnet series between the species Grossular and Hibschite Ca3Al2(SiO4)3-x(OH)4x, with hydroxide (OH) partially replacing silica (SiO4). Hydrogrossular is found in massive crystal habit, sometimes grown in with idocrase. 
Additional recommended knowledge
Hydrogrossular is translucent to opaque, and found in green to bluish green, pink, white, and gray. The cause of the green color is chromium, and possibly iron. Pink hydrogrossular is caused by the presence of manganese. Hydrogrossular may have dark gray to black small inclusions. It has similarites to jade, and has the misnomers transvaal jade, and african jade.
Hydrogrossular is sometimes used as a gemstone, being cabochon cut, or made into beads. Sources for green and pink hydrogrossular are South Africa, Canada, and the US. White hydrogrossular is sourced from Burma and China.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydrogrossular". A list of authors is available in Wikipedia.|